package com.gaofeng.day14;

import java.util.StringJoiner;

public class demo06 {
    public static void main(String[] args) {
        //
        StringJoiner sj = new StringJoiner(",", "[", "]");
//        StringJoiner reslut = sj.add("aaa").add("bbb").add("ccc");
//        System.out.println(reslut);

        int[] arr = {1,2,3,4};

    }
}
